Amongst the Passeres, such forms as the larks, stone-chats, finches, linnets and grosbeaks are well developed, and exhibit many species.
The birds of this genus - the crossbills - when their other characters are taken into account, prove to be intimately allied on the one hand to the grosbeaks (Pinicola) and on the other through the redpolls (Aegiothus) to the linnets (Linota) - if indeed these two can be properly separated.
The linnets, through the genus Leucosticte, lead to the mountain-finches (Montifringilla), and the redpolls through the siskins (Chrysomitris) to the goldfinches (Carduelis); and these last again to the hawfinches, one group of which (Coccothraustes) is apparently not far distant from the chaffinches (Fringilla proper), and the other (Hesperiphona) seems to be allied to the greenfinches (Ligurinus) .
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